Long-Span Bridges: Engineering Marvels for Safe and Efficient Transportation

Long-span refers to a bridge or other structure that has a main span (the distance between the supports) that is relatively long compared to the width of the structure. In general, a long-span bridge is one with a main span of 100 meters (328 feet) or more.

Long-span bridges are often used to cross wide rivers, valleys, or other obstacles where there is no room for a shorter bridge. They can be made of various materials, such as steel, concrete, or combinations of both, and can take many forms, including suspension bridges, cable-stayed bridges, and arch bridges.

Some examples of long-span bridges include:

* The Golden Gate Bridge in San Francisco, California, which has a main span of 1.7 miles (2.7 kilometers)
* The Akashi Kaikyo Bridge in Japan, which has a main span of 6,532 feet (2,024 meters)
* The Three Gorges Bridge in China, which has a main span of 4,300 feet (1,310 meters)

Overall, long-span bridges are an engineering marvel that allow for safe and efficient transportation over long distances.